I am a volcanologist and planetary geologist. I do research on two distinct topical areas, volcanology and planetary geology. My volcanology research makes use of the diverse, abundant, and young volcanoes and volcanic landforms of New Mexico to understand how volcanoes work. My research in planetary geology focuses on solar system exploration using the field geologic methods we use here on Earth and geologic analogs here in New Mexico. I am an active member of the Mars Exploration Rover Science Team where I am pioneering the use of field geology on Mars. I have participated in other NASA planetary missions over the years, including Viking, Pathfinder, and Mars Exploration Rover missions and Magellan synthetic aperture radar mapping missions to Venus.